rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12880/1:b..l
rcu: 	(detected by 0, t=10502 jiffies, g=117897, q=140 ncpus=2)
task:kworker/u4:7    state:R  running task     stack:22640 pid:12880 ppid:2      flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0xee1/0x59f0 kernel/sched/core.c:6710
 preempt_schedule_irq+0x52/0x90 kernel/sched/core.c:7022
 irqentry_exit+0x35/0x80 kernel/entry/common.c:433
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x1ef/0x510 kernel/locking/lockdep.c:5729
Code: c1 05 55 6f 9b 7e 83 f8 01 0f 85 b0 02 00 00 9c 58 f6 c4 02 0f 85 9b 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc9000510fac8 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92000a21f5b RCX: 0000000000000001
RDX: 1ffff1100f1c5510 RSI: ffffffff8a6c7780 RDI: ffffffff8ac80560
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff23095d0
R10: ffffffff9184ae87 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8c9a6580 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:303 [inline]
 rcu_read_lock include/linux/rcupdate.h:749 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
 batadv_nc_worker+0x175/0x10f0 net/batman-adv/network-coding.c:719
 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
 worker_thread+0x687/0x1110 kernel/workqueue.c:2748
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
rcu: rcu_preempt kthread starved for 10526 jiffies! g117897 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:28672 pid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0xee1/0x59f0 kernel/sched/core.c:6710
 schedule+0xe7/0x1b0 kernel/sched/core.c:6786
 schedule_timeout+0x157/0x2c0 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x1ec/0xa50 kernel/rcu/tree.c:1609
 rcu_gp_kthread+0x249/0x380 kernel/rcu/tree.c:1808
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 30273 Comm: syz-executor.2 Not tainted 6.5.0-rc4-syzkaller-00211-ge6fda526d9db #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
RIP: 0010:__kasan_check_read+0x8/0x20 mm/kasan/shadow.c:31
Code: 5d 41 5c c3 48 83 c4 60 48 c7 c7 58 b1 16 8c 5b 5d 41 5c e9 2a 53 8f ff 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 8b 0c 24 <89> f6 31 d2 e9 0f f4 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f
RSP: 0018:ffffc90004edfc10 EFLAGS: 00000256
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81670a35
RDX: 1ffff11004801815 RSI: 0000000000000008 RDI: ffffffff8eab8d10
RBP: 1ffff920009dbf85 R08: 0000000000000000 R09: fffffbfff23095d6
R10: ffffffff9184aeb7 R11: 0000000000000000 R12: ffff88802ccf27a0
R13: 1ffff920009dbfaf R14: ffffc90004edffe0 R15: 00007fd5a4a29cf0
FS:  00007fd5a4a2a6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd5a4a29ec0 CR3: 000000008b3e7000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 cpumask_test_cpu include/linux/cpumask.h:504 [inline]
 cpu_online include/linux/cpumask.h:1082 [inline]
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0xa5/0x680 kernel/locking/lockdep.c:5772
 __might_fault mm/memory.c:5856 [inline]
 __might_fault+0x156/0x190 mm/memory.c:5849
 __clear_user arch/x86/include/asm/uaccess_64.h:167 [inline]
 clear_user arch/x86/include/asm/uaccess_64.h:191 [inline]
 copy_siginfo_to_user+0x74/0xb0 kernel/signal.c:3353
 x64_setup_rt_frame+0x886/0x1170 arch/x86/kernel/signal_64.c:194
 setup_rt_frame arch/x86/kernel/signal.c:221 [inline]
 handle_signal arch/x86/kernel/signal.c:265 [inline]
 arch_do_signal_or_restart+0x450/0x5f0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd5a3c7cae7
Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89
RSP: 002b:00007fd5a4a2a178 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fd5a3d9bf88 RCX: 00007fd5a3c7cae9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd5a3d9bf88
RBP: 00007fd5a3d9bf80 R08: 00007fd5a4a2a6c0 R09: 00007fd5a4a2a6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd5a3d9bf8c
R13: 000000000000000b R14: 00007ffecc571640 R15: 00007ffecc571728
 </TASK>